City withholding is shown in box 19 of your W-2 and is entered ("added") in TurboTax (TT) with your other W-2 info at the W-2 screen.
If you made city estimated payments and/or paid a balance due, last year,
In TurboTax (TT), enter at:
Federal Taxes Tab
Deductions & Credits
-Scroll down to:
--Estimates & other taxes paid
-Estimates
-Other Income taxes
